I'm afraid I'm with FFF and Whirly in the 'dinosaur' camp - the only time I've flown with a GPS with moving map, I spent a lot of time with my head 'down' (even though the display *was* at coaming level); some of this was tinkering with the new toy, but partly I was just being lazy.
I did use it to skirt between Southampton CTR and a Danger Area as I was flying to Thruxton - ISTR there was a relatively narrow 'corridoor' of 3-4 miles at one point that I had to be quite careful not to stray too far either way (and there were few VRPs and a fairly stiff crosstrack breeze on that day!).
Other than that, give me a good VOR and ADF and I'll be happy; I'm a bit disappointed that the group to which I belong have just voted to use this year's avionics budget to install GPS (rather than fix the broken VOR and put in an ADF!). Looks like I'll have to use another hairyplane for my IMC rating!